Block height - The block quantity and size on the blockchain (in blocks) on generation of the present block Nonce - The transaction number for the from address (bear in mind this begins at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://bookmarkspecial.com/story20404038/new-step-by-step-map-for-blockchain-explorer-unconfirmed-transaction-https-intensedebate-com-people-hawkwhorl3